Thats what's needed to win a Premier League-Champions League Double these days, its as simple as that.
They're probably short in defence, I'd say they need CB and a LB
2 in fact, since Kompany was never replaced & Otamendi is simply not good enough to play at this level. Hence why they have (potentially) lost the League to a side that still has Lovern on their books.
and probably a striker if Jesus goes
Aguero is likely to leave after next season so even if Jesus stays, they need another Striker.
Kompany, Otamendi, Fernandinho, D.Silva & (eventually) Aguero all need to be replaced. Likewise the injury record of Mendy means that City requires another LB while another winger is needed to enable B.Silva to move full time into Midfield. Thats why 7 are needed and in turn that is why Sane should not leave
(1), because him leaving would require another Winger to be signed.
(1) If I was handling the Sane siutation, I would keep him for next season and give him more game time during said season (made easier by the fact B.Silva would no longer be playing on the Wing next season) while persuading him to sign a new deal. If he stil wants to go to a club that puts Canadian Teenagers at LB, then he can go so long as Bayern make a decent offer (£100+ Million) after next season.
The ultimate point being that Sane either goes after next season for a high price, or stays beyond it.
You're also in some weird reality where they're expecting to win both the PL and CL next season, but will be free of FFP because of the ban, thereby not even being in the CL to begin with...
City would not be free of FFP due to a potential CL Ban, but rather because FFP itself has been suspended due to COVID-19
(1). Thus CL Ban or no CL ban
(2), FFP would not apply to Man City next season, or any other club for that matter...
(1) https://www.theguardian.com/footbal...end-financial-fair-play-rules-due-to-pandemic
(2) Although lets be real; even if the CAS is willing to support an idiotic policy such as FFP, there is nothing stopping the club from taking UEFA to the European Courts over its monopoly on European Club Football (and its abuse of it via FFP).